CN202486698U

CN202486698U - Multi-function password input unit

Info

Publication number: CN202486698U
Application number: CN201120228778XU
Authority: CN
Inventors: 张持健; 白采玉; 丁银银; 费悦
Original assignee: Anhui Normal University
Current assignee: Anhui Normal University
Priority date: 2011-06-22
Filing date: 2011-06-22
Publication date: 2012-10-10
Anticipated expiration: 2021-06-22

Abstract

A simple safe multi-function password input unit can achieve inputting numbers from 0 to 9, letters from A to Z and also symbols. The password input unit adopts a one-chip microcomputer as a central control unit and meanwhile uses an LCD display module. Four keys (a +1 key, a -1 key, an affirming key, a deleting key) are applied for operating the numbers. The +1 key and the -1 key are applied for choosing a target letter and displaying the letter on the LCD display module. By pressing the +1 key and the -1 key, the changing speed for inputting the letters can be adaptively adjusted. Through the serial port communication technology, the password input unit can have serial communications with a PC machine. A one-bit letter can be input through the affirming key and the letter can be deleted through the deleting key. The multi-function password input unit provided in the utility model has the advantages of simple structure, low power consumption, low cost and strong practicality. The multi-function password unit is suitably applied in occasions requiring inputs of numbers, letters or other symbols, especially in ATMs, stock transaction machines and corridor code locks. The safety of using password input devices is effectively improved.

Description

The multifunction cipher input unit

Technical field

This utility model relates to keyboard, be easy, can be safing, the multifunction cipher input unit that is applicable to numeral (0-9), letter (A-Z) or the input of other conventional sign, especially be applicable to ATM, stock exchange machine, corridor coded lock.

Background technology

At present, the keyboard that common PIN PAD uses generally all is the nature keyboard, and each button is represented fixing a numeral or a symbol.In the daily life; We often use ATM to withdraw cash (employed natural keyboard generally includes only numbers and symbols) or the stock exchange machine is concluded the business; But; The public place personnel are more, and the key position that the lawless person presses on keyboard according to the operator is stolen withdrawer's password, bring potential safety hazard for our property.Therefore, improve the security that input media uses effectively, the solution of this problem is very necessary.

Summary of the invention

In order to overcome the deficiency that existing keyboard password is decrypted easily and lacks letter; Ensure people's property safety; The utility model provides a kind of multifunction cipher input unit; It is simple in structure, has broken the fixedly tradition of keyboard, greatly reduces the lawless person and steals the especially possibility of withdrawer's password of input content.

The utility model solves the technical scheme that its technical matters adopted: the utility model is to be linked to each other with CPU (4) respectively by Voltage stabilizing module 7805 (1), LCD display module (5), Keysheet module (6), RS-232 communication interface, forms the multifunction cipher input unit of walk away safety.Keysheet module (6) through adding 1 key and subtracting 1 key select target numerical value, not only can carry out the input of digital 0-9; Can also carry out the input of symbol on alphabetical A-Z or the computer keyboard, on LCD, show, and the speed adaptive of the character change of input is adjustable; Send to PC by acknowledgement key; Through the input character of delete key deletion error, carry out serial communication with PC and carry out data transmission, thus the input of completion character.

The beneficial effect of the utility model is: can control random digit easily through+1 key ,-1 key; Select oneself character of obtaining of expectation; Password setting has increased letter and conventional sign again; Reduced the possibility stolen of lawless person widely, improved the security that PIN PAD uses effectively input content, especially ATM withdrawer password.This utility model not only can realize the input of numeral (0-9) but also can realize the input of letter (A-Z) and other conventional signs; And the character change speed adaptive of this multifunction cipher input unit input is adjustable, thereby the character that can find us to import apace.The utility model is not only simple in structure, and low-power consumption, low cost, practical.

Description of drawings

Below in conjunction with accompanying drawing and embodiment native system is further specified.

Fig. 1 is the utility model structure diagram.

Fig. 2 is the utility model circuit diagram.

Fig. 3 is the simple and easy process flow diagram of the utility model single-chip microcomputer end program.

Fig. 4 is the utility model PC working condition figure when communicating by letter with PC.

Embodiment

In Fig. 1, be the utility model structure diagram, system is a core with 51 single-chip microcomputers, Voltage stabilizing module 7805 (1) is used in combination LCD display module (5) and Keysheet module (6), through RS-232 communication interface and PC communication for system provides+the 5V power supply.

In Fig. 2, be the utility model circuit diagram.Native system provides+the 5V power supply for system through Voltage stabilizing module 7805 (1); Power interface is a Φ 6mm socket (2), turns on the power switch (3), and power light this moment (9) is lighted; Keysheet module in the system (6) links to each other with P2.0, P2.1, P2.5, P2.6 in the single-chip microcomputer; At this moment, single-chip microcomputer (4) control LCD display module (5) shows random number.Single button through Keysheet module (6)---add 1 key and subtract symbol on 1 key select target numerical value 0-9 or alphabetical A-Z or the computer keyboard, and go up demonstration at LCD display module (5).Send to PC by acknowledgement key, delete through delete key.Single-chip microcomputer (4) is connected through D0, D1, D2, D3, D4, D5, D6, the D7 of P1.0, P1.1, P1.2, P1.3, P1.4, P1.5, P1.6, P1.7 port and LCD module; Display digit, letter or symbol, and the speed adaptive of the character change of input is adjustable.Via MAX232 (7) single-chip microcomputer (4) and PC are carried out level conversion, be connected with PC,, accomplish data transmission in conjunction with PC end software through DB9 (8) interface.

Keysheet module among Fig. 1 (6) button K1, K2, K3, K4 are as shown in the figure, below are to use method:

1) start back system reads random number, and on the LCD, first row is fixing to show " Password Input: ", numeral of the second interline position display at this moment.

2) the K1 key is the numerical value key that " adds 1 ", clicks the K1 key, numerical value+1, and the numerical value correspondence shows on LCD; Pin the K1 key and do not put, numerical value adds 1 fast, and from numeral 0 to 9, alphabetical A shows change on LCD to changing fast between the Z.

3) the K2 key is the numerical value key that " subtracts 1 ", clicks the K2 key, numerical value-1, and the numerical value correspondence shows on LCD; Pin the K2 key and do not put, numerical value subtracts 1 fast, and from numeral 0 to 9, alphabetical A shows change on LCD to changing fast between the Z.

4) the K3 key is " affirmation " key, selects and has confirmed that a character is through sending data to PC by the K3 key.

5) the K4 key is " deletion " key, presses K4 key deleted data on PC.Click the K4 key, delete a character.

In Fig. 3, be the scm software of circuit process flow diagram roughly.Numerical value through the numeral selection of button operation system demonstration is expected shows on LCD, has improved the security of input media, the security that especially has cipher input equipment to use.

In Fig. 4, through operation push-button select target numerical value from random number, system connects PC through Serial Port Line and shows that PC end software is write through VB.Be ATM password log-in interface among the figure, show " please import six bank card password " among the figure, select numerical value through button; And through the acknowledgement key transmission; At this moment, PC begins to receive data, accepts data; The password log-in interface shows one " * " on the screen, shows " * * * * * * " on the final screen.

Claims

1. multifunction cipher input unit, it is characterized in that: Voltage stabilizing module 7805 (1), LCD display module (5), Keysheet module (6), RS-232 communication interface (7) link to each other with CPU (4) respectively.

2. according to the described multifunction cipher input unit of claim 1; It is characterized in that: Keysheet module (6) through adding 1 key and subtracting symbol on 1 key select target numerical value 0-9 or alphabetical A-Z or the computer keyboard, shows on LCD; Send to the pc machine by acknowledgement key, through the input character of delete key deletion error.

3. according to the described multifunction cipher input unit of claim 1, it is characterized in that: the speed adaptive of the character change of input is adjustable.